a=eks,b=wye,i=4,x=0.38139939,y=0.13418874
a=wye,b=pan,i=5,x=0.57328892,y=0.86362447
a=zee,b=pan,i=6,x=0.52712616,y=0.49322129
a=eks,b=zee,i=7,x=0.61178406,y=0.18788492
